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  1. Salt dissolution, artwork
  2. Love Birds
  3. Bare-knuckle Boxers
  4. Vintage Golden Gate
  5. Carboniferous landscape
  6. Lung bronchioles
  7. Viral throat infection, artwork
  8. Lungs
  9. Clouds forming the shape of Earth's continents
  10. Carrigogunnell Castle, Near Limerick, County Limerick, Ireland
  11. Sierre to Zinal Mountain Race, The Finish 2012
  12. Platelet, artwork
  13. 19th Century internal combustion engine
  14. Construction of the Pyramids
  15. Artwork of Mars Polar Lander descending onto Mars
  16. Rhodopsin protein molecule
  17. Composite image of the phases of the Moon
  18. Ichthyosaur and prey
  19. Durer's world map, 1515
  20. TEEN Flutter of Love
  21. Chinese armada, artwork
  22. Cabeza De Vaca Expedition
  23. 'How vain are all your triumphs past', 1814
  24. sports car with high speed
  25. Sound Wave 2
  26. Walleye on Map
  27. Armillary sphere, 18th Century artwork
  28. Magnetic field
  29. Instruments for removing bladder stones
  30. Snap!
  31. Detail of 16th century map of Liguria
  32. Neanderthals hunt a cave bear
  33. Steamboats on the Mississippi
  34. Leptin molecule
  35. Wooded Path II
  36. Triceratops
  37. Famous places and monuments of the world
  38. Environs Of Paris 1
  39. City Of Golden Dreams - Contemporary Cityscape Painting
  40. Early electric train
  41. Alveoli
  42. Early stromatolites, artwork
  43. Woolly mammoths
  44. Protein tyrosine phosphatase molecule
  45. Construction of the DH.98 Mosquito fighter-bomber of World War II
  46. Rustic Bovine I
  47. Mountain, or sewellel, beaver
  48. Linear Paws II